Employee Benefit Plans Net Periodic Benefit Costs Weighted Average Assumptions (Details)	12 Months Ended
	Jan. 31, 2018	Jan. 31, 2017	Jan. 31, 2016
Defined Benefit Plan Disclosure [Line Items]
Expected Return on Plan Assets	7.00%	7.00%	7.50%
Qualified Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount Rate	4.25%	4.50%	3.75%
Rate of Increase in compensation	3.00%	3.00%	2.75%
Other Pension, Postretirement and Supplemental Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Rate of Increase in compensation	4.25%	4.25%	4.25%
Supplemental Employee Retirement Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount Rate	4.25%	4.25%	3.75%
Rate of Increase in compensation	6.50%	6.50%	7.25%
Other Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount Rate	4.25%	4.50%	3.50%
Other Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount Rate	1.49%	1.40%	1.71%
Rate of Increase in compensation	1.38%	1.38%	1.56%